1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) Wipro Technologies Ltd, 2003. All Rights Reserved.
4 *
5 * Author: Aniruddha Marathe <[email protected]>
6 *
7 * Ported to new library:
8 * 07/2019 Christian Amann <[email protected]>
9 */
10 /*
11 * This tests the timer_settime(2) syscall under various conditions:
12 *
13 * 1) General initialization: No old_value, no flags
14 * 2) Setting a pointer to a itimerspec struct as old_set parameter
15 * 3) Using a periodic timer
16 * 4) Using absolute time
17 *
18 * All of these tests are supposed to be successful.
19 *
20 * This is also regression test for commit:
21 * f18ddc13af98 ("alarmtimer: Use EOPNOTSUPP instead of ENOTSUPP")
22 * e86fea764991 ("alarmtimer: Return relative times in timer_gettime")
23 */
24
25 #include <stdlib.h>
26 #include <errno.h>
27 #include <time.h>
28 #include <signal.h>
29 #include "time64_variants.h"
30 #include "tst_timer.h"
31
32 static struct tst_ts timenow;
33 static struct tst_its new_set, old_set;
34 static kernel_timer_t timer;
35
36 static struct testcase {
37 struct tst_its *old_ptr;
38 int it_value_tv_usec;
39 int it_interval_tv_usec;
40 int flag;
41 char *description;
42 } tcases[] = {
43 {NULL, 50000, 0, 0, "general initialization"},
44 {&old_set, 50000, 0, 0, "setting old_value"},
45 {&old_set, 50000, 50000, 0, "using periodic timer"},
46 {&old_set, 50000, 0, TIMER_ABSTIME, "using absolute time"},
47 };
48
49 static struct time64_variants variants[] = {
50 #if (__NR_timer_settime != __LTP__NR_INVALID_SYSCALL)
51 { .clock_gettime = sys_clock_gettime, .timer_gettime = sys_timer_gettime, .timer_settime = sys_timer_settime, .ts_type = TST_KERN_OLD_TIMESPEC, .desc = "syscall with old kernel spec"},
52 #endif
53
54 #if (__NR_timer_settime64 != __LTP__NR_INVALID_SYSCALL)
55 { .clock_gettime = sys_clock_gettime64, .timer_gettime = sys_timer_gettime64, .timer_settime = sys_timer_settime64, .ts_type = TST_KERN_TIMESPEC, .desc = "syscall time64 with kernel spec"},
56 #endif
57 };
58
59 static volatile int caught_signal;
60
clear_signal(void)61 static void clear_signal(void)
62 {
63 /*
64 * The busy loop is intentional. The signal is sent after X
65 * seconds of CPU time has been accumulated for the process and
66 * thread specific clocks.
67 */
68 while (!caught_signal);
69
70 if (caught_signal != SIGALRM) {
71 tst_res(TFAIL, "Received incorrect signal: %s",
72 tst_strsig(caught_signal));
73 }
74
75 caught_signal = 0;
76 }
77
sighandler(int sig)78 static void sighandler(int sig)
79 {
80 caught_signal = sig;
81 }
82
setup(void)83 static void setup(void)
84 {
85 tst_res(TINFO, "Testing variant: %s", variants[tst_variant].desc);
86 SAFE_SIGNAL(SIGALRM, sighandler);
87 }
88
run(unsigned int n)89 static void run(unsigned int n)
90 {
91 struct time64_variants *tv = &variants[tst_variant];
92 struct testcase *tc = &tcases[n];
93 long long val;
94 unsigned int i;
95
96 tst_res(TINFO, "Testing for %s:", tc->description);
97
98 for (i = 0; i < CLOCKS_DEFINED; ++i) {
99 clock_t clock = clock_list[i];
100
101 TEST(tst_syscall(__NR_timer_create, clock, NULL, &timer));
102 if (TST_RET != 0) {
103 if (possibly_unsupported(clock) &&
104 (TST_ERR == EINVAL || TST_ERR == ENOTSUP)) {
105 tst_res(TCONF | TTERRNO, "%s unsupported",
106 get_clock_str(clock));
107 } else {
108 tst_res(TFAIL | TTERRNO,
109 "timer_create(%s) failed",
110 get_clock_str(clock));
111 }
112 continue;
113 }
114
115 memset(&new_set, 0, sizeof(new_set));
116 memset(&old_set, 0, sizeof(old_set));
117
118 new_set.type = old_set.type = tv->ts_type;
119 val = tc->it_value_tv_usec;
120
121 if (tc->flag & TIMER_ABSTIME) {
122 timenow.type = tv->ts_type;
123 if (tv->clock_gettime(clock, tst_ts_get(&timenow)) < 0) {
124 tst_res(TFAIL,
125 "clock_gettime(%s) failed - skipping the test",
126 get_clock_str(clock));
127 continue;
128 }
129 tst_ts_add_us(timenow, val);
130 tst_its_set_value_from_ts(&new_set, timenow);
131 } else {
132 tst_its_set_value_from_us(&new_set, val);
133 }
134
135 tst_its_set_interval_from_us(&new_set, tc->it_interval_tv_usec);
136
137 TEST(tv->timer_settime(timer, tc->flag, tst_its_get(&new_set), tst_its_get(tc->old_ptr)));
138
139 if (TST_RET != 0) {
140 tst_res(TFAIL | TTERRNO, "timer_settime(%s) failed",
141 get_clock_str(clock));
142 }
143
144 TEST(tv->timer_gettime(timer, tst_its_get(&new_set)));
145 if (TST_RET != 0) {
146 tst_res(TFAIL | TTERRNO, "timer_gettime(%s) failed",
147 get_clock_str(clock));
148 } else if ((tst_its_get_interval_nsec(new_set) !=
149 tc->it_interval_tv_usec * 1000) ||
150 (tst_its_get_value_nsec(new_set) >
151 MAX(tc->it_value_tv_usec * 1000, tc->it_interval_tv_usec * 1000))) {
152 tst_res(TFAIL | TTERRNO,
153 "timer_gettime(%s) reported bad values (%llu: %llu)",
154 get_clock_str(clock),
155 tst_its_get_interval_nsec(new_set),
156 tst_its_get_value_nsec(new_set));
157 }
158
159 clear_signal();
160
161 /* Wait for another event when interval was set */
162 if (tc->it_interval_tv_usec)
163 clear_signal();
164
165 tst_res(TPASS, "timer_settime(%s) passed",
166 get_clock_str(clock));
167
168 TEST(tst_syscall(__NR_timer_delete, timer));
169 if (TST_RET != 0)
170 tst_res(TFAIL | TTERRNO, "timer_delete() failed!");
171 }
172 }
173
174 static struct tst_test test = {
175 .test = run,
176 .needs_root = 1,
177 .tcnt = ARRAY_SIZE(tcases),
178 .test_variants = ARRAY_SIZE(variants),
179 .setup = setup,
180 .tags = (const struct tst_tag[]) {
181 {"linux-git", "f18ddc13af98"},
182 {"linux-git", "e86fea764991"},
183 {}
184 }
185 };
186